dts/bindings/clock/st,stm32l0-pll-clock.yaml

# Copyright (c) 2021, Linaro ltd
# SPDX-License-Identifier: Apache-2.0

description: |
  STM32L0/L1 Main PLL.

  Takes one of clk_hse, clk_hsi or clk_msi as input clock, with an
  input frequency from 2 to 24 MHz.

  The desired PLL frequency can be computed with the following formula:

    f(PLL) = f(VCO clock) / PLLDIV  --> PLLCLK (System Clock)

      with f(VCO clock) = f(PLL clock input) × PLLMUL --> PLLVCO

  The PLL output frequency must not exceed 32 MHz.

compatible: "st,stm32l0-pll-clock"

include: [clock-controller.yaml, base.yaml]

properties:
  "#clock-cells":
    const: 0

  clocks:
    required: true

  div:
    type: int
    required: true
    description: |
        PLL output division
    enum:
      - 2
      - 3
      - 4

  mul:
    type: int
    required: true
    description: |
        PLL multiplication factor for VCO
        The PLL VCO clock frequency must not exceed:
        - 96 MHz when the product is in Range 1
        - 48 MHz when the product is in Range 2
        - 24 MHz when the product is in Range 3
        If the USB uses the PLL as clock source, the PLL VCO clock must be
        programmed to output a 96 MHz frequency (USBCLK = PLLVCO/2).
    enum:
      - 3
      - 4
      - 6
      - 8
      - 12
      - 16
      - 24
      - 32
      - 48